(19)

(11)

EP 4 146 551 A1

(12)

(43) Date of publication: 15.03.2023 Bulletin 2023/11 (21) Application number: 21800331.7 (22) Date of filing: 04.05.2021

(51) International Patent Classification (IPC):  B65D 1/34(2006.01) B65D 1/40(2006.01) B65D 81/34(2006.01) B31B 50/59(2017.01) B65D 77/20(2006.01) B31B 110/35(2017.01) (52) Cooperative Patent Classification (CPC): B65D 1/34; B65D 81/34; B65D 1/40; B31B 50/592; B31B 50/88; B31B 2110/35; Y02A 40/90 (86) International application number: PCT/IB2021/053699 (87) International publication number: WO 2021/224770 (11.11.2021 Gazette 2021/45)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 04.05.2020 SE 2050511 (71) Applicant: Stora Enso Oyj 00101 Helsinki (FI)	(72) Inventors: RIBU, Ville 53900 Lappeenranta (FI) MIIKKI, Nina 55100 Imatra (FI) HILTUNEN, Mari 55800 Imatra (FI) VARIS, Juha 53100 Lappeenranta (FI) TANNINEN, Panu 55320 Rauha (FI) KAINUSALMI, Mika 54800 Savitaipale (FI) (74) Representative: Steinrud, Henrik  Stora Enso AB Group Intellectual Property Box 9090 65009 Karlstad 65009 Karlstad (SE)